``No other network provider offers a better service level agreement
than this one,'' said Paul Vixie, chief technology officer of
Metromedia Fiber Network. ``Our guarantee ensures 100% IP network
availability and facility power to address the needs of our customers
for reliable performance.''

MFN's extensive fiber-optic network, combined with AboveNet's
state-of-the-art co-location facilities, enables the company to
provide superior network performance to back up the 100% SLA
guarantee. The layered and regionalized network allows for isolation
and seamless redundancy in case of network problems, as well as
phasing of software and hardware upgrades to ensure continuous
up-time. The ISX facilities provide the most advanced, fail-safe data
center environment available, as well as superior Internet
connectivity. And, MFN's unmatched number of peering relationships and
high-quality connections also support the delivery of information
directly to the destination network, ensuring improved performance.

For customers, the SLA agreements will provide an additional sense
of security and peace of mind when moving mission-critical
applications to the Internet. While the service remains as efficient
and effective as always, customers now have MFN's commitment in
writing.

About Metromedia Fiber Network, Inc.

Metromedia Fiber Network, Inc., the leading provider of end-to-end
optical network solutions, is revolutionizing the fiber-optic
industry. By offering virtually unlimited, unmetered bandwidth at a
fixed cost, Metromedia Fiber Network is eliminating the bandwidth
barrier and redefining the way broadband capacity is sold. Metromedia
Fiber Network is extending metropolitan fiber-optic infrastructure to
the end-user in strategic top-tier markets, enabling its customers to
implement the latest data, video, Internet and multimedia
applications. In addition to its current expansion in 51 cities in
North America, Metromedia Fiber Network is establishing an
international presence with planned fiber-optic network builds in 16
cities throughout Europe. For more information about Metromedia Fiber
Network, please visit the company's Web site at www.mmfn.com.

Together with its subsidiaries, AboveNet Communications, Inc., a
leading provider of Internet connectivity and co-location solutions
for high-bandwidth and business-critical applications, and PAIX.net,
Inc., the leading neutral Internet exchange, Metromedia Fiber Network
is unleashing the full potential of the Internet. The combined company
facilitates the explosive growth of e-commerce and advanced Internet
applications by delivering secure, reliable and scaleable optical
networks and IP services to Internet content and service providers,
carriers and enterprise users worldwide.

AboveNet is the architect of the Internet Service Exchange (ISX),
a world-class network that provides co-location services and Internet
connectivity for content providers, ISPs and application service
providers. With its Tier 1 status and ISO 9002 certification, AboveNet
is seeking to serve the global community of the Internet. For more
information on AboveNet's service offering call 800/475-2733 or visit
the company's Web site at www.above.net.

AboveNet, Internet Service Exchange, ISX, and AboveNet One-Hop
Network are trademarks of AboveNet Communications, Inc. All other
company or brand names may be trademarks of the respective companies
with which they are associated.

This news release contains forward-looking statements that involve
risks and uncertainties. Factors that could cause or contribute to
such risks and uncertainties include, but are not limited to, general
economic and business conditions, competition, changes in technology
and methods of marketing, and various other factors beyond the
Company's control. This also includes such factors as are described
from time to time in the SEC reports filed by Metromedia Fiber Network
including the most recently filed Forms S-3, 10-K and 10-Q.